"Download to Zotero" option disappeared/not working when downloading PDFs and documents

Hi - I use the Firefox extension. For the first week or so of using it, when I clicked to download PDFs and documents, a very convenient "download to Zotero" option was there along with "Open With..." and "Save file".

The "download to Zotero" option has now disappeared - I have tried searching for an answer and playing with preferences but to no avail. Has anyone else experienced this / found a solution? It was very useful for downloading articles directly into collections, to attach to publications.
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